US20070062720A1 - Reduced alien crosstalk electrical cable with filler element - Google Patents
Reduced alien crosstalk electrical cable with filler element Download PDFInfo
- Publication number
- US20070062720A1 US20070062720A1 US11/601,787 US60178706A US2007062720A1 US 20070062720 A1 US20070062720 A1 US 20070062720A1 US 60178706 A US60178706 A US 60178706A US 2007062720 A1 US2007062720 A1 US 2007062720A1
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- Prior art keywords
- insulated conductors
- filler element
- twisted pairs
- cable
- width
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1895—Internal space filling-up means
Definitions
- the present invention relates to an electrical cable that reduces alien crosstalk between cables. More specifically, a filler element disposed in the electrical cable reduces alien crosstalk between adjacent cables.
- ANEXT Alien near-end crosstalk
- AFEXT alien far-end crosstalk
- SNR signal to noise ratio
- BER bit error rate
- ANEXT and AFEXT occur when some of the signal current in a twisted pair of one cable couples with another twisted pair of another cable external to the signal path and along the path of a circuit between the two pairs. That noise corrupts the signal in the twisted pair external to the original signal path.
- the circuit between the noise emitting and receiving twisted pairs egresses one cable boundary and crosses another cable boundary, the noise becomes alien crosstalk.
- an electrical cable that includes a cable jacket defining a central longitudinal axis and a plurality of twisted pairs of insulated conductors oriented longitudinally within the cable jacket. Each of the twisted pairs of insulated conductors has a width.
- a filler element is disposed in the cable jacket and is located adjacent to at least one of the twisted pairs of insulated conductors. The filler element defines a width that is substantially larger than the width of each the twisted pairs of insulated conductors.
- the filler element has a central axis laterally offset from the central longitudinal axis of the cable jacket. The filler element reduces alien crosstalk from an adjacent cable.
- the present invention also provides an electrical cable that includes a cable jacket that defines a central longitudinal axis and a substantially non-circular outer perimeter.
- a plurality of twisted pairs of insulated conductors are oriented longitudinally within the cable jacket. Each of the twisted pairs of insulated conductors has a width.
- a filler element is disposed in the cable jacket and located adjacent to at least one of the twisted pairs of insulated conductors.
- the filler element has a central axis laterally offset from the central longitudinal axis of the cable jacket.
- the filler element is substantially circular in section transverse to the central axis and defines a diameter that is substantially larger than the width of each the twisted pairs of insulated conductors. The filler element reduces alien crosstalk from an adjacent cable.
- FIG. 1 is a drawing of a perspective view of an electrical cable according to a first embodiment of the present invention
- FIG. 2 is a drawing of an elevational view in section of the electrical cable illustrated in FIG. 1 , showing a plurality of twisted pairs of insulated conductors and a filler element enclosed by a cable jacket;
- FIG. 3 is a drawing of an elevational view in section of an electrical cable according to a second embodiment of the present invention.
- FIG. 4 is a drawing of an elevational view in section of an electrical cable according to a third embodiment of the present invention.
- an electrical cable 100 includes a plurality of twisted pairs of insulated conductors 102 and a filler element 104 for reducing alien crosstalk between adjacent cables. More specifically, the filler element 104 increases the cable diameter along one axis 106 of the cable 100 cross-section, effectively increasing the net distance between the pairs of insulated conductors 102 in the cable 100 from twisted pairs of insulated conductors of an adjacent cable (not shown).
- the electrical cable 100 has a cable jacket 202 that encloses the filler element 104 and the plurality of twisted pairs of insulated conductors 102 in an inner area 204 defined by the inner perimeter 206 of the cable jacket 202 .
- the plurality of twisted pairs of insulated conductors 102 preferably include four pairs of insulated conductors 208 , 210 , 212 , and 214
- the electrical cable 100 can include any number of twisted pairs of insulated conductors.
- the cable jacket 202 can be formed of a dielectric material, such as PVC, TA-910, or polyolefin low smoke zero halogen.
- Each twisted pair of insulated conductors 208 , 210 , 212 , and 214 defines a width 216 and is supported in a first region 218 of the cable jacket 202 .
- the cable jacket 202 defines a generally central longitudinal axis 220 .
- the cable 100 can be twisted about the central longitudinal axis 220 , as seen in FIG. 1 .
- a second region 222 supports the filler element 104 .
- the filler element 104 has a generally cylindrical rod shape, with a substantially circular cross-sectional shape, and defines a width or diameter 224 and has a central axis 226 .
- the first and second regions 218 and 222 are generally continuous.
- the width 228 of the first region 218 is substantially larger than the width 230 of the second region 222 , thereby creating an uneven or lopsided outer perimeter 232 of the cable jacket 202 , such that the shape of the electrical connector 100 in section transverse to the longitudinal axis 220 is substantially non-circular, as seen in FIG. 2 .
- the width 228 of the first region 218 is about twice the width 230 of the second region 222 .
- the width 228 of the first region 218 can be any size with respect to width 230 of the second region 222 , such as the same as or slightly larger than the width 230 of the second region 222 , as long as the first region 218 can accommodate the twisted pairs of insulated conductors 102 and the second region 222 can accommodate the filler element 104 .
- the outer perimeter 232 is asymmetrical and defines a transition area 234 between the larger first region 218 and the smaller second region 222 .
- the width 224 of the filler element 104 is substantially larger than the width 216 of each of the twisted pairs of insulated conductors 208 , 210 , 212 and 214 .
- the central axis 226 of the filler element 104 is laterally offset from the central longitudinal axis 220 of the cable 100 .
- the width 224 of the filler element 104 is larger than the width 216 of the individual pairs of insulated conductors 208 , 210 , 212 and 214 , the pairs 208 , 219 , 212 and 214 are prevented from encircling the filler element 104 , thereby preventing coaxial alignment of the central axis 226 of the filler element 104 and the central longitudinal axis 220 of the electrical cable 100 .
- the non-circular cross-sectional shape of the electrical cable 100 is maintained.
- the lopsided shape and the increased diameter along the axis 106 of the electrical cable reduces alien crosstalk between adjacent cables 100 by increasing the distance from the twisted pairs of insulated conductors of the adjacent cables 100 .
- the filler element 104 is preferably shaped as a cylindrical rod, the filler element 104 can have any circular, elliptical or polygonal shape in cross-section.
- the filler element 104 can be formed of a single material or multiple materials.
- the filler element 104 can be made of a dielectric material, such as polypropylene, polyolefin insulation, rigid PVC insulation, or low smoke PVC insulation.
- the filler element 104 can be made of both dielectric and conductive materials.
- the filler element 104 can be formed with a copper core and any one of FEP insulation or fluoropolymers, low smoke PVC insulation, rigid insulation, polyolefin insulation, or polypropylene insulation.
- an electrical cable 300 in accordance with a second embodiment of the present invention is the same as the electrical cable 100 of the first embodiment, except a second filler element 304 is disposed in a third region 336 of the cable jacket 302 .
- the third region 336 is substantially the same size as the second region 222 and the second filler element 304 is substantially the same size as the first filler element 104 .
- the outer perimeter 332 of the cable jacket 302 is uneven with a non-circular cross-section; however, unlike the first embodiment, the outer perimeter is substantially symmetrical about a vertical axis of FIG. 3 .
- the second filler element 304 has a central axis 326 that is offset from the central longitudinal axis 320 of the cable 300 .
- the second filler element 304 further increases the distance between neighboring cables along axis 106 to reduce alien crosstalk caused by an adjacent cable.
- an electrical cable 400 in accordance with a fourth embodiment of the present invention includes a filler element 404 and the plurality of twisted pairs of insulated conductors 202 supported in a cable jacket 405 .
- the filler element 404 is similar to the filler element 104 , except that it is larger, preferably about twice the width 216 of each twisted pair of insulated conductors 208 , 210 , 212 and 214 .
- the cable jacket 405 of the cable 400 includes a single region 418 for supporting the filler element 404 and the plurality of twisted pairs 202 .
- the filler element 404 also includes a conductive core 408 .
- the cross-sectional shape of the cable 400 is non-circular, such as an elliptical shape.
- the non-circular shape of the cable 400 defines an even outer perimeter 432 of the cable jacket 406 .
- the non-circular cross-sectional shape of the cable jacket 406 increases the diameter of the cable 400 along one axis 406 of the cable 400 .
- a central axis 426 of the filler element 404 is offset from the central longitudinal axis 420 of the cable 400 .
- the width or diameter 424 of the filler element 404 is about twice the width 216 of each twisted pair of insulated conductors 208 , 210 , 212 , and 214 , the pairs 208 , 210 , 212 , and 214 are prevented from encircling the filler element 404 , so that the filler element 404 remains offset from the central longitudinal axis 420 of the cable 400 . Similar to the first and second embodiments, by fashioning the cable 400 in this manner, the distance between twisted pairs of insulated conductors of adjacent cables is increased, thereby reducing alien crosstalk.
- any number of filler elements can be employed with the cable including one, two, or more than two filler elements.
Abstract
An electrical cable includes a cable jacket defining a central longitudinal axis and a plurality of twisted pairs of insulated conductors oriented longitudinally within the cable jacket. Each of the twisted pairs of insulated conductors has a width. A filler element is disposed in the cable jacket and is located adjacent to at least one of the twisted pairs of insulated conductors. The filler element defines a width that is substantially larger than the width of each the twisted pairs of insulated conductors. The filler element has a central axis laterally offset from the central longitudinal axis of the cable jacket. The filler element reduces alien crosstalk from an adjacent cable.
Description
- The present invention relates to an electrical cable that reduces alien crosstalk between cables. More specifically, a filler element disposed in the electrical cable reduces alien crosstalk between adjacent cables.
- Interference between electrical cables bundled together in a cabling system decreases the efficiency of data transmission by the cabling system. Alien near-end crosstalk (ANEXT) and alien far-end crosstalk (AFEXT) noise is caused by the electrical unbalance between the twisted pairs of insulated conductors of adjacent cables. ANEXT and AFEXT are transmission noises that can increase the signal to noise ratio (SNR) and bit error rate (BER) in a cable transmission system, such as for a local area network.
- Specifically, ANEXT and AFEXT occur when some of the signal current in a twisted pair of one cable couples with another twisted pair of another cable external to the signal path and along the path of a circuit between the two pairs. That noise corrupts the signal in the twisted pair external to the original signal path. When the circuit between the noise emitting and receiving twisted pairs egresses one cable boundary and crosses another cable boundary, the noise becomes alien crosstalk.
- According to the present invention, there is provided an electrical cable that includes a cable jacket defining a central longitudinal axis and a plurality of twisted pairs of insulated conductors oriented longitudinally within the cable jacket. Each of the twisted pairs of insulated conductors has a width. A filler element is disposed in the cable jacket and is located adjacent to at least one of the twisted pairs of insulated conductors. The filler element defines a width that is substantially larger than the width of each the twisted pairs of insulated conductors. The filler element has a central axis laterally offset from the central longitudinal axis of the cable jacket. The filler element reduces alien crosstalk from an adjacent cable.
- The present invention also provides an electrical cable that includes a cable jacket that defines a central longitudinal axis and a substantially non-circular outer perimeter. A plurality of twisted pairs of insulated conductors are oriented longitudinally within the cable jacket. Each of the twisted pairs of insulated conductors has a width. A filler element is disposed in the cable jacket and located adjacent to at least one of the twisted pairs of insulated conductors. The filler element has a central axis laterally offset from the central longitudinal axis of the cable jacket. The filler element is substantially circular in section transverse to the central axis and defines a diameter that is substantially larger than the width of each the twisted pairs of insulated conductors. The filler element reduces alien crosstalk from an adjacent cable.
- Advantages and salient features of the invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the present invention.
- A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
-
FIG. 1 is a drawing of a perspective view of an electrical cable according to a first embodiment of the present invention; -
FIG. 2 is a drawing of an elevational view in section of the electrical cable illustrated inFIG. 1 , showing a plurality of twisted pairs of insulated conductors and a filler element enclosed by a cable jacket; -
FIG. 3 is a drawing of an elevational view in section of an electrical cable according to a second embodiment of the present invention; and -
FIG. 4 is a drawing of an elevational view in section of an electrical cable according to a third embodiment of the present invention. - Referring to
FIGS. 1 and 2 , anelectrical cable 100 according to a first embodiment of the present invention includes a plurality of twisted pairs ofinsulated conductors 102 and afiller element 104 for reducing alien crosstalk between adjacent cables. More specifically, thefiller element 104 increases the cable diameter along oneaxis 106 of thecable 100 cross-section, effectively increasing the net distance between the pairs ofinsulated conductors 102 in thecable 100 from twisted pairs of insulated conductors of an adjacent cable (not shown). - As seen in
FIG. 2 , theelectrical cable 100 has acable jacket 202 that encloses thefiller element 104 and the plurality of twisted pairs ofinsulated conductors 102 in an inner area 204 defined by theinner perimeter 206 of thecable jacket 202. Although the plurality of twisted pairs ofinsulated conductors 102 preferably include four pairs ofinsulated conductors electrical cable 100 can include any number of twisted pairs of insulated conductors. Thecable jacket 202 can be formed of a dielectric material, such as PVC, TA-910, or polyolefin low smoke zero halogen. - Each twisted pair of
insulated conductors width 216 and is supported in afirst region 218 of thecable jacket 202. Thecable jacket 202 defines a generally centrallongitudinal axis 220. Thecable 100 can be twisted about the centrallongitudinal axis 220, as seen inFIG. 1 . Asecond region 222 supports thefiller element 104. Thefiller element 104 has a generally cylindrical rod shape, with a substantially circular cross-sectional shape, and defines a width ordiameter 224 and has acentral axis 226. The first andsecond regions - The
width 228 of thefirst region 218 is substantially larger than thewidth 230 of thesecond region 222, thereby creating an uneven or lopsidedouter perimeter 232 of thecable jacket 202, such that the shape of theelectrical connector 100 in section transverse to thelongitudinal axis 220 is substantially non-circular, as seen inFIG. 2 . Preferably, thewidth 228 of thefirst region 218 is about twice thewidth 230 of thesecond region 222. However, thewidth 228 of thefirst region 218 can be any size with respect towidth 230 of thesecond region 222, such as the same as or slightly larger than thewidth 230 of thesecond region 222, as long as thefirst region 218 can accommodate the twisted pairs ofinsulated conductors 102 and thesecond region 222 can accommodate thefiller element 104. Theouter perimeter 232 is asymmetrical and defines atransition area 234 between the largerfirst region 218 and the smallersecond region 222. - The
width 224 of thefiller element 104 is substantially larger than thewidth 216 of each of the twisted pairs ofinsulated conductors central axis 226 of thefiller element 104 is laterally offset from the centrallongitudinal axis 220 of thecable 100. By offsetting theaxes cable 100 and thefiller element 104, respectively, and due to the size of thefiller element 104, the diameter of thecable 100 along theaxis 106 is increased. Because thewidth 224 of thefiller element 104 is larger than thewidth 216 of the individual pairs ofinsulated conductors pairs filler element 104, thereby preventing coaxial alignment of thecentral axis 226 of thefiller element 104 and the centrallongitudinal axis 220 of theelectrical cable 100. Thus the non-circular cross-sectional shape of theelectrical cable 100 is maintained. The lopsided shape and the increased diameter along theaxis 106 of the electrical cable reduces alien crosstalk betweenadjacent cables 100 by increasing the distance from the twisted pairs of insulated conductors of theadjacent cables 100. - Although the
filler element 104 is preferably shaped as a cylindrical rod, thefiller element 104 can have any circular, elliptical or polygonal shape in cross-section. Thefiller element 104 can be formed of a single material or multiple materials. For example, thefiller element 104 can be made of a dielectric material, such as polypropylene, polyolefin insulation, rigid PVC insulation, or low smoke PVC insulation. Alternatively, thefiller element 104 can be made of both dielectric and conductive materials. For example, thefiller element 104 can be formed with a copper core and any one of FEP insulation or fluoropolymers, low smoke PVC insulation, rigid insulation, polyolefin insulation, or polypropylene insulation. - Referring to
FIG. 3 , anelectrical cable 300 in accordance with a second embodiment of the present invention is the same as theelectrical cable 100 of the first embodiment, except a second filler element 304 is disposed in athird region 336 of thecable jacket 302. Thethird region 336 is substantially the same size as thesecond region 222 and the second filler element 304 is substantially the same size as thefirst filler element 104. Theouter perimeter 332 of thecable jacket 302 is uneven with a non-circular cross-section; however, unlike the first embodiment, the outer perimeter is substantially symmetrical about a vertical axis ofFIG. 3 . Like thefiller element 104, the second filler element 304 has acentral axis 326 that is offset from the centrallongitudinal axis 320 of thecable 300. The second filler element 304 further increases the distance between neighboring cables alongaxis 106 to reduce alien crosstalk caused by an adjacent cable. - Referring to
FIG. 4 , anelectrical cable 400 in accordance with a fourth embodiment of the present invention includes afiller element 404 and the plurality of twisted pairs ofinsulated conductors 202 supported in a cable jacket 405. Thefiller element 404 is similar to thefiller element 104, except that it is larger, preferably about twice thewidth 216 of each twisted pair ofinsulated conductors cables cable 400 includes asingle region 418 for supporting thefiller element 404 and the plurality oftwisted pairs 202. Thefiller element 404 also includes aconductive core 408. - Like the
cables cable 400 is non-circular, such as an elliptical shape. The non-circular shape of thecable 400 defines an even outer perimeter 432 of thecable jacket 406. The non-circular cross-sectional shape of thecable jacket 406 increases the diameter of thecable 400 along oneaxis 406 of thecable 400. Acentral axis 426 of thefiller element 404 is offset from the centrallongitudinal axis 420 of thecable 400. Since the width ordiameter 424 of thefiller element 404 is about twice thewidth 216 of each twisted pair ofinsulated conductors pairs filler element 404, so that thefiller element 404 remains offset from the centrallongitudinal axis 420 of thecable 400. Similar to the first and second embodiments, by fashioning thecable 400 in this manner, the distance between twisted pairs of insulated conductors of adjacent cables is increased, thereby reducing alien crosstalk. - While particular embodiments have been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined in the appended claims. For example, any number of filler elements can be employed with the cable including one, two, or more than two filler elements.
Claims (14)
1-22. (canceled)
23. An electrical cable, comprising
a cable jacket defining a central longitudinal axis;
at least first, second, third, and fourth twisted pairs of insulated conductors oriented longitudinally within said cable jacket and forming a core, each of said twisted pairs of insulated conductors defining a width; and
a filler element disposed in said cable jacket and located adjacent to at least one of said twisted pairs of insulated conductors, said filler element defining a width that is substantially larger than said width of each said twisted pairs of insulated conductors, said filler element having a central axis laterally offset from said central longitudinal axis of said cable jacket, and said filler element being twisted around said core.
24. An electrical cable according to claim 23 , wherein
said cable jacket has an asymmetrical shape.
25. An electrical cable according to claim 23 , wherein
said filler elements is a solid, unitary one-piece member.
26. An electrical cable according to claim 23 , wherein
said filler element is devoid of insulated conductors.
27. An electrical cable, comprising
a cable jacket defining a central longitudinal axis, said cable jacket having an asymmetrical shape;
a plurality of twisted pairs of insulated conductors oriented longitudinally within said cable jacket and forming a core, each of said twisted pairs of insulated conductors defining a width; and
a filler element disposed in said cable jacket and located adjacent to at least one of said twisted pairs of insulated conductors, said filler element defining a width that is substantially larger than said width of each said twisted pairs of insulated conductors, said filler element having a central axis laterally offset from said central longitudinal axis of said cable jacket, and said filler element being twisted around said core.
28. An electrical cable according to claim 27 , wherein
said plurality of twisted pairs of insulated conductors includes at least first, second, third and fourth pairs of insulated conductors.
29. An electrical cable according to claim 27 , wherein
said filler elements is a solid, unitary one-piece member.
30. An electrical cable according to claim 27 , wherein
said filler element is devoid of insulated conductors.
31. An electrical cable, comprising
a cable jacket defining a central longitudinal axis;
a plurality of twisted pairs of insulated conductors oriented longitudinally within said cable jacket, each of said twisted pairs of insulated conductors defining a width; and
a filler element disposed in said cable jacket and located adjacent to at least one of said twisted pairs of insulated conductors, said filler element defining a width that is substantially larger than said width of each said twisted pairs of insulated conductors, said filler element having a central axis laterally offset from said central longitudinal axis of said cable jacket, and said filler element being twisted around said plurality of twisted pairs of insulated conductors forming a core that has an asymmetrical shape.
32. An electrical cable according to claim 31 , wherein
said plurality of twisted pairs of insulated conductors includes at least first, second, third and fourth pairs of insulated conductors.
33. An electrical cable according to claim 31 , wherein
said cable jacket having an asymmetrical shape.
34. An electrical cable according to claim 31 , wherein
said filler elements is a solid, unitary one-piece member.
35. An electrical cable according to claim 31 , wherein
said filler element is devoid of insulated conductors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/601,787 US7317164B2 (en) | 2004-12-16 | 2006-11-20 | Reduced alien crosstalk electrical cable with filler element |
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US11/012,167 US7157644B2 (en) | 2004-12-16 | 2004-12-16 | Reduced alien crosstalk electrical cable with filler element |
US11/601,787 US7317164B2 (en) | 2004-12-16 | 2006-11-20 | Reduced alien crosstalk electrical cable with filler element |
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US11/012,167 Continuation US7157644B2 (en) | 2004-12-16 | 2004-12-16 | Reduced alien crosstalk electrical cable with filler element |
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US20070062720A1 true US20070062720A1 (en) | 2007-03-22 |
US7317164B2 US7317164B2 (en) | 2008-01-08 |
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US11/601,787 Expired - Fee Related US7317164B2 (en) | 2004-12-16 | 2006-11-20 | Reduced alien crosstalk electrical cable with filler element |
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2004
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2006
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US7157644B2 (en) * | 2004-12-16 | 2007-01-02 | General Cable Technology Corporation | Reduced alien crosstalk electrical cable with filler element |
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US7157644B2 (en) | 2007-01-02 |
US7317164B2 (en) | 2008-01-08 |
US20060131055A1 (en) | 2006-06-22 |
CN101164119A (en) | 2008-04-16 |
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